Exhaust Noise Test For Epa

[(OO)SKYLINE(OO)]

Put your stock exhaust back on, install a shitty cat converter (So a non high flow one) and put in a resinator just before the rear muffler.

Test it and see how you go.

That should shut the F**king EPA up.

[Weapon]

he did test it in the open, it was outside in the carpark area at 9.30 am very little traffic, and he did it like 3 or 4 times.

in reference to ur quiet/sport mode question my 34 has a swith under the dash from factory to make the exhast go louder or quieter by directing the exhaust gas into either side of the muffler (one is fatter and one is skinner)

lilydale is a big drive for me but it might be worth it i guess because my car is not really loud at all

That sounds like a Varex muffler or something, never seen that stock on a 34 GTT. also, why the hell did they make you rev it to 5000rpm? when mine got tested it was to 4000-4500rpm from memory

Edited March 31, 2009 by Weapon

[R31Nismoid]

That sounds like a Varex muffler or something

exactly what im thinking.

He is saying its a stock exhaust, but i suspect otherwise

[nIsMo86]

I have heard from someone on here once before that the stock 34 gtt rear muffler is a variable type with a switch. Can any r34 gtt people confirm this?

[cankas]

Mine has no switch or adjustable muffler and the stock exhaust is quiet as, can hardly hear it in the car.

[some_cs_student]

Could you confirm what a "stock" exhaust is? Stock cat? Stock mufflers?

Is it stock from the turbo/engine back?

[Kujotk]

yes they can its happened to me twice now, once for my supra na and now the 34, the supra however was f**king loud lol. na with extractors and a straight 3 inch pipi no cat and 4 inch muffler

na supras are the lodest things around with even a small exhaust..... friend at work has it with just a 3.5 cat back and it is atleast 3 times as loud as my turbo back 3-3.5inch....

i recon it also has to do with the type of metal used..... my fujitsubo exhaust is actually very quite compared to similar exhaust made of different material....

[MBS206]

How far away from the exhaust tip did he have the microphone?

From your description he had it right at the exhaust tip...

[ducki]

something must be wrong.. I just had a noise test awhile ago and I did 89dB with stock catback, 3" split dump/front and metal cat on my GTT. I had mine tested in St Albans.

[urtwhistle]

na supras are the lodest things around with even a small exhaust..... friend at work has it with just a 3.5 cat back and it is atleast 3 times as loud as my turbo back 3-3.5inch....

i recon it also has to do with the type of metal used..... my fujitsubo exhaust is actually very quite compared to similar exhaust made of different material....

All NA cars are loud because the turbo stops the exhaust resonating.

[FLN75S]

Isnt it the Nismo exhaust option that was factory on some R34 GTT that has the switch to swap between the 2 mufflers?

[GUN_METAL_GTR32]

Put your stock exhaust back on, install a shitty cat converter (So a non high flow one) and put in a resinator just before the rear muffler.

Test it and see how you go.

That should shut the F**king EPA up.

it is the stock exhaust dude. it has the cat in it from compliance.

i have a resonator and a muffler in my boot which i will be hopefully putting on tonight and then testing again in the morning,

[GUN_METAL_GTR32]

Could you confirm what a "stock" exhaust is? Stock cat? Stock mufflers?

Is it stock from the turbo/engine back?

yes stock everything. with the switchable muffler thing.

[GUN_METAL_GTR32]

How far away from the exhaust tip did he have the microphone?

From your description he had it right at the exhaust tip...

i reckon it was about 50-70cm away and he had it a little bit of angle as well, he had this triangle shaped ruler to measure it (the distance)

[GUN_METAL_GTR32]

Isnt it the Nismo exhaust option that was factory on some R34 GTT that has the switch to swap between the 2 mufflers?

well mine has a swith on it just under the steering wheel is says sport and quiet ( i think) i honestly cant tell the difference between the 2 setting until high revs really. i left it in quiet mode for the test obviously.

[(OO)SKYLINE(OO)]

it is the stock exhaust dude. it has the cat in it from compliance.

i have a resonator and a muffler in my boot which i will be hopefully putting on tonight and then testing again in the morning,

Cool!

Get the resonator and the muffler put on and see how you go...

You will probley find that the exhaust will be very restrictive, so don't hammer it too hard.

Untill you goto the EPA and let them rev it, pass the test then free it up again.

[R31Nismoid]

Resonator wont do shit.

[Brandon]

I'm sure someone's posted the link to this file before but no harm doing it again. Heres the file for the ADR standard used for testing exhaust to 90dB.

ADR_28.01_FRLI_Mar_06.pdf

Maybe I should bring my car to have it tested by someone to see whats the dB level. I really have no idea how does 85dB and 95dB sound like on a car. How much does it cost to get it tested by someone anyone knows? Or getting those dB meter on ebay (50bucks cheapass) will do the trick? I'm probably hijacking the thread but does anyone know if the Trust Ti-R come with a baffle? Mine seems to be straight thru and someone told me before Ti-R arent that loud to begin with. Heres the spec provided by Trust.

From the looks of it it should be on the 94dB level but my friend who's heard it told me it'll probably be 98 or even higher (I'm thinking its the baffle that was removed). And also does being an N1 affect the noise...?

Let me know what you've done as I'm really looking for alternatives to current exhaust or modifying it to a decent dB level (90-92 if not below 90). Cheers!

[GUN_METAL_GTR32]

I'm sure someone's posted the link to this file before but no harm doing it again. Heres the file for the ADR standard used for testing exhaust to 90dB.

ADR_28.01_FRLI_Mar_06.pdf

Maybe I should bring my car to have it tested by someone to see whats the dB level. I really have no idea how does 85dB and 95dB sound like on a car. How much does it cost to get it tested by someone anyone knows? Or getting those dB meter on ebay (50bucks cheapass) will do the trick? I'm probably hijacking the thread but does anyone know if the Trust Ti-R come with a baffle? Mine seems to be straight thru and someone told me before Ti-R arent that loud to begin with. Heres the spec provided by Trust.

From the looks of it it should be on the 94dB level but my friend who's heard it told me it'll probably be 98 or even higher (I'm thinking its the baffle that was removed). And also does being an N1 affect the noise...?

Let me know what you've done as I'm really looking for alternatives to current exhaust or modifying it to a decent dB level (90-92 if not below 90). Cheers!

the test was $35.00

[3LGODZILA]

dont weld anything into your system. you know that security screen shit that some backdoors ect. have, its metal with lots of little holes in it, get some of that or something similar, cut it out in the shape of a gasket and stick it somewhere in your system, and dont thrash your car when your restricting the exhaust system also. i was speaking to the owner of an exhaust shop and he told me this is how all the big v8s get over the pits.